Free actionsD20PFSRD in Pathfinder take almost no time. But can they be performed outside of one’s turn or in response to some trigger?
Scenario 1: Can a Barbarian enter rage in response to taking damage outside of her turn? Likewise, can anyone drop prone in response to being attacked from distance?
Scenario 2: Can a Barbarian enter rage in response to taking damage during her turn (for example, as a result of an attack of opportunity)?
